Best practices on using EVALUATE functions

hi, experts,
I wanna know what is the best practices on using EVALUATE functions on obiee (calling oracle user defined functions)
I found that if I use evaluate functions in Answers,
obiee will construct a sql behind and then execute.
sometimes, obiee contructs some unexpected sqls, and returns errors.
so, is it better to use EVALUATE functions in logical columns ?
thanks

EVALUATE('DB_Function(%1)' as returntype, {Comma separated Expression})
even when used in Logical columns, its gonna fire the same sql.

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